.content-div{
    width: 100%;
    height: 750px;
    border: 1px solid #e2e2e2;
}

.form-div{
    width: 40%;
    height: 75%;
    padding: 2%;
    margin: 8% auto 0;
    border-radius: 5px;
    border: 1px solid #e2e2e2;
    box-shadow: 0px 0px 10px #e2e2e2;
}

.form-div h4{
    text-align: center;
    height: 50px;
    line-height: 50px;
    border-bottom: 1px solid #e2e2e2;
}

.row.g-3.form-con{
    padding-left: 60px;
}

.form-control{
    text-align: center;
}

.btn.btn-primary{
    width: 100%;
}

.tips{
    margin: 20px auto 0;
    color: red;
    font-size: 14px;
    text-align: center;
}

.wrong{
    color: red;
    border-color: red;
}